U.S. patent application number 15/185644 was filed with the patent office on 2017-10-05 for glass material, fluorescent composite material, and light-emitting device.
The applicant listed for this patent is CHINA GLAZE CO., LTD.. Invention is credited to Yi-Cheng CHIU, Chih-Sheng LIN, Sung-Yu TSAI, Chia-Hung TSENG, Su-Jen WANG.
Application Number | 20170284633 15/185644 |
Document ID | / |
Family ID | 59687988 |
Filed Date | 2017-10-05 |
United States Patent
Application |
20170284633 |
Kind Code |
A1 |
CHIU; Yi-Cheng ; et
al. |
October 5, 2017 |
GLASS MATERIAL, FLUORESCENT COMPOSITE MATERIAL, AND LIGHT-EMITTING
DEVICE
Abstract
A glass material is provided, which has a composition of
M.sub.2O--ZnO-M'.sub.20.sub.3--Bi.sub.2O.sub.3--SiO.sub.2, wherein
M is Li, Na, K, or a combination thereof, and M' is B, Al, or a
combination thereof. A fluorescent composite material can be
composed of the glass material and a phosphor material. The
fluorescent composite material may collocate with an excitation
light source to provide a light-emitting device.
Inventors: |
CHIU; Yi-Cheng; (Hsinchu,
TW) ; LIN; Chih-Sheng; (Hsinchu, TW) ; TSAI;
Sung-Yu; (Hsinchu, TW) ; WANG; Su-Jen;
(Hsinchu, TW) ; TSENG; Chia-Hung; (Hsinchu,
TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
CHINA GLAZE CO., LTD. |
Hsinchu |
|
TW |
|
|
Family ID: |
59687988 |
Appl. No.: |
15/185644 |
Filed: |
June 17, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C09K 11/7774 20130101;
F21V 9/38 20180201; C09K 11/025 20130101; C03C 3/091 20130101; C03C
3/093 20130101; C03C 2204/00 20130101; C09K 11/7734 20130101; C03C
4/12 20130101; C03C 8/02 20130101; C03C 8/04 20130101; C03C 3/062
20130101; C03C 3/066 20130101; C03C 14/006 20130101; H01L 33/502
20130101; F21V 9/32 20180201; C03C 2214/16 20130101 |
International
Class: |
F21V 9/16 20060101
F21V009/16; C09K 11/77 20060101 C09K011/77; C03C 4/12 20060101
C03C004/12; C09K 11/02 20060101 C09K011/02; C03C 3/066 20060101
C03C003/066; C03C 3/062 20060101 C03C003/062 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 29, 2016 |
TW |
105109809 |
Claims
1. A glass material, having a composition of:
M.sub.2O--ZnO-M'.sub.2O.sub.3--Bi.sub.2O.sub.3--SiO.sub.2, wherein
M is Li, Na, K, or a combination thereof; and M' is B, Al, or a
combination thereof, wherein the glass material has 0.5 wt % to 20
wt % of M.sub.2O; 1 wt % to 20 wt % of ZnO; 3 wt % to 60 wt % of
M'.sub.2O.sub.3; 25 wt % to 90 wt % of Bi.sub.2O.sub.3; and 1 wt %
to 30 wt % of SiO.sub.2.
2. The glass material as claimed in claim 1, having 5 wt % to 10 wt
% of M.sub.2O; 5 wt % to 20 wt % of ZnO; 3 wt % to 24.5 wt % of
M'.sub.20.sub.3; 60 wt % of Bi.sub.2O.sub.3; and 7 wt % to 10 wt %
of SiO.sub.2.
3. The glass material as claimed in claim 1, wherein
Bi.sub.2O.sub.3 and M.sub.2O have a weight ratio of 100:0.8 to
100:80; Bi.sub.2O.sub.3 and ZnO have a weight ratio of 100:1 to
100:80; Bi.sub.2O.sub.3 and M'.sub.2O.sub.3 have a weight ratio of
100:3 to 100:200; and Bi.sub.2O.sub.3 and SiO.sub.2 have a weight
ratio of 100:1 to 100:50.
4. The glass material as claimed in claim 1, wherein
Bi.sub.2O.sub.3 and M.sub.2O have a weight ratio of 100:0.8 to
100:16.7; Bi.sub.2O.sub.3 and ZnO have a weight ratio of 100:8 to
100:34; Bi.sub.2O.sub.3 and M'.sub.2O.sub.3 have a weight ratio of
100:5 to 100:40.8; and Bi.sub.2O.sub.3 and SiO.sub.2 have a weight
ratio of 100:11 to 100:16.6.
5. A fluorescent composite material, comprising: a phosphor
material; and the glass material as claimed in claim 1.
6. The fluorescent composite material as claimed in claim 5,
wherein the fluorescent material is red phosphor material, a green
phosphor material, a yellow phosphor material, or a combination
thereof.
7. The fluorescent composite material as claimed in claim 5,
wherein the phosphor material comprises silicate, nitride,
oxynitride, sulfide, or aluminate.
8. The fluorescent composite material as claimed in claim 5,
wherein the phosphor material and the glass material have a weight
ratio of 1:999 to 90:10.
9. A light-emitting device, comprising: an excitation light source;
and the fluorescent composite material as claimed in claim 5 on the
excitation light source.
10. The light-emitting device as claimed in claim 9, wherein the
excitation light source includes light-emitting diode, laser diode,
organic light-emitting diode, cold cathode fluorescent lamp, or
external-electrode fluorescent lamp.
11. The light-emitting device as claimed in claim 9, being applied
to illumination, projection, automotive headlights, or displays.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] The present application is based on, and claims priority
from, Taiwan Application Serial Number 105109809, filed on Mar. 29,
2016, the disclosure of which is hereby incorporated by reference
herein in its entirety.
TECHNICAL FIELD
[0002] The technical field relates to a fluorescent composite
material of a glass material and a phosphor material, and in
particular it relates to the composition of the glass material.
BACKGROUND
[0003] The light-emitting diode (LED) is considered a revolutionary
light source with the potential to replace incandescent lamps and
fluorescent lamps due to its properties of being energy-saving, and
thus less harmful to the environment, as well as the continuous
enhancements being made to LED light-emitting efficiency. There are
various approaches for generating white light with LEDs: (a)
combining with trichromatic RGB LED chips; (b) blue-light LED chip
comprised of one or more visible light-emitting phosphors.
Phosphor-converted LEDs (pc-LED) are the most common LED based
white light source. The phosphor material relates to light-emitting
efficiency, stability, color rendering, color temperature, and
lifetime, thereby being the most critical material in the white
light LED.
[0004] In a conventional LED package, phosphor powder and an
organic matrix material (e.g. silicone) are mixed and then applied
on the LED. However, the above skill has at least two shortcomings:
(1) the refractive index mismatch of the silicone and the phosphor
powder: silicone generally has a refractive index of about 1.5, and
the common YAG phosphor has a refractive index of 1.85, such that
the refractive index therebetween will negatively influence the
light-extraction efficiency of the package; and (2) silicone is an
organic substance, and its environmental stability needs to be
enhanced in high-power applications.
[0005] Accordingly, a novel matrix material for the phosphor powder
is called for to overcome the problems caused by conventional
organic silicone.
SUMMARY
[0006] One embodiment of the disclosure provides a glass material,
having a composition of:
M.sub.2O--ZnO-M'.sub.2O.sub.3--Bi.sub.2O.sub.3--SiO.sub.2, wherein
M is Li, Na, K, or a combination thereof; and M' is B, Al, or a
combination thereof, wherein the glass material has 0.5 wt % to 20
wt % of M.sub.2O; 1 wt % to 20 wt % of ZnO; 3 wt % to 60 wt % of
M'.sub.2O.sub.3; 25 wt % to 90 wt % of Bi.sub.2O.sub.3; and 1 wt %
to 30 wt % of SiO.sub.2.
[0007] One embodiment of the disclosure provides a fluorescent
composite material, comprising: a phosphor material; and the
described glass material.
[0008] One embodiment of the disclosure provides a light-emitting
device, comprising: an excitation light source; and the described
fluorescent composite material on the excitation light source.
[0009] A detailed description is given in the following embodiments
with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The disclosure can be more fully understood by reading the
subsequent detailed description and examples with references made
to the accompanying drawings, wherein:
[0011] FIGS. 1, 3, 5, 6, and 8 show emission spectra of fluorescent
composite material in embodiments of the disclosure.
[0012] FIGS. 2, 4, 7, and 9-13 show electroluminescent spectra of
package structures of a blue LED and fluorescent composite
materials in embodiments of the disclosure.
DETAILED DESCRIPTION
[0013] In the following detailed description, for purposes of
explanation, numerous specific details are set forth in order to
provide a thorough understanding of the disclosed embodiments. It
will be apparent, however, that one or more embodiments may be
practiced without these specific details. In other instances,
well-known structures and devices are schematically shown in order
to simplify the drawing.
[0014] In the disclosure, the phosphor material is collocated with
a glass material to manufacture a phosphor composite material to
overcome the problems caused by the organic silicone. The glass
material formulation is tuned to achieve a high refractive index
(>2), thereby increasing the light extraction efficiency. In
addition, the glass material is an inorganic material with a higher
chemical stability than that of organic packaging resin. However,
the red phosphor material easily reacts with a common glass
material, such that the light-emitting properties of the composite
after sintering are decayed. In other words, the common glass
material and the red phosphor material have an insufficient
compatibility. For overcoming the problem of the insufficient
compatibility between the glass material and the phosphor material,
one embodiment of the disclosure provides a glass material having a
composition of:
M.sub.2O--ZnO-M'.sub.2O.sub.3--Bi.sub.2O.sub.3--SiO.sub.2, wherein
M is Li, Na, K, or a combination thereof; and M' is B, Al, or a
combination thereof. When the total weight of the glass material is
set as reference (100 wt %), the glass material has 0.5 wt % to 20
wt % of M.sub.2O, 1 wt % to 20 wt % of ZnO, 3 wt % to 60 wt % of
M'.sub.2O.sub.3, 25 wt % to 90 wt % of Bi.sub.2O.sub.3, and 1 wt %
to 30 wt % of SiO.sub.2. In another embodiment, the glass material
has 5 wt % to 10 wt % of M.sub.2O, 5 wt % to 20 wt % of ZnO, 3 wt %
to 24.5 wt % of M'.sub.2O.sub.3, 60 wt % of Bi.sub.2O.sub.3, and 7
wt % to 10 wt % of SiO.sub.2. When the Bi.sub.2O.sub.3 weight is
set as reference (100 parts by weight), Bi.sub.2O.sub.3 and
M.sub.2O have a weight ratio of 100:0.8 to 100:80, Bi.sub.2O.sub.3
and ZnO have a weight ratio of 100:1 to 100:80, Bi.sub.2O.sub.3 and
M'.sub.2O.sub.3 have a weight ratio of 100:3 to 100:200, and
Bi.sub.2O.sub.3 and SiO.sub.2 have a weight ratio of 100:1 to
100:50. In another embodiment, Bi.sub.2O.sub.3 and M.sub.2O have a
weight ratio of 100:0.8 to 100:16.7, Bi.sub.2O.sub.3 and ZnO have a
weight ratio of 100:8 to 100:34, Bi.sub.2O.sub.3 and
M'.sub.2O.sub.3 have a weight ratio of 100:5 to 100:40.8, and
Bi.sub.2O.sub.3 and SiO.sub.2 have a weight ratio of 100:11 to
100:16.6.
[0015] Bi.sub.2O.sub.3 may greatly decrease the softening point
temperature and increase the refractive index of the glass
material. Too little amount of Bi.sub.2O.sub.3 makes the softening
point temperature of the glass material beyond the acceptable range
of the phosphor material. Therefore, the efficiency was found to
decline dramatically after sintering. On the other hand, when its
content become more, a glass material cannot be formed because of
low viscosity and the chemical durability tends to deteriorate.
[0016] M.sub.2O has an effect to lower the melting point of the
glass material. Too little amount of M.sub.2O cannot efficiently
lower the melting point of the glass material, such that an overly
high sintering temperature may cause the light-emitting properties
of the fluorescent composite material to decay. Too much amount of
M.sub.2O will lower the chemical resistance of the glass material.
When M.sub.2O is K.sub.2O, the larger atomic radius of K atom may
strengthen the bonding. Simultaneously, the coefficient of
expansion of K.sub.2O is less than Na.sub.2O, such that the
flexibility and thermal stability of the glass material are
enhanced by K.sub.2O.
[0017] ZnO may assist in melting, lowering the coefficient of
expansion, increasing the gloss, and widening the glass sintering
temperature range. Too little amount of ZnO does not assist in
melting. Too much amount of ZnO causes it to easily crystallize
with SiO.sub.2, thereby negatively influencing the glass
transparency and glass structural strength.
[0018] B.sub.2O.sub.3 is a component to lower the melting point of
the glass material. However, too much amount of B.sub.2O.sub.3 may
cause the chemical durability of the glass material tends to
deteriorate. Al.sub.2O.sub.3 may increase the abrasion resistance
of the glass material and viscosity at the melting point.
Nevertheless, too little amount of M'.sub.2O.sub.3 results in an
insufficient glass strength. Too much amount of M'.sub.2O.sub.3 may
enhance the glass softening point.
[0019] In general, SiO.sub.2 is the component for forming the glass
network. Too much amount of SiO.sub.2 may increase the melting
point and the softening point of the glass material. Consequently,
the efficiency of fluorescent composite material was found to
decline dramatically after sintering. The glass material cannot be
formed by too little amount of SiO.sub.2, thereby degrading the
chemical durability of the material.
[0020] In one embodiment, M.sub.2O, ZnO, M'.sub.2O.sub.3,
Bi.sub.2O.sub.3, and SiO.sub.2 are weighed according to the above
ratios, and then heated to be melted. The melted mixture is
water-quenched to form a glass bulk. The glass bulk is initially
cracked and then ball-milled to obtain glass powder with D.sub.50
of about 10 .mu.m to 20 .mu.m. The glass powder and a phosphor
powder are mixed evenly, filled into a mold, and then molded by oil
hydraulic compression to form a preform. The preform is then
sintered at 400.degree. C. to 650.degree. C. to form a fluorescent
composite material. It should be understood that the glass powder
and the phosphor powder are mixed with each other rather than
separated into different layers.
[0021] In one embodiment, the phosphor powder has a D.sub.50 of
about 10 .mu.m to 20 .mu.m. The phosphor material can be red
phosphor material, green phosphor material, yellow phosphor
material, or a combination thereof. The red phosphor material can
be silicate such as
(Ba.sub.1-x-ySr.sub.xCa.sub.y).sub.2SiO.sub.4:Eu.sup.2+, nitride
such as (Ca,Sr)AlSiN.sub.3:Eu.sup.2+ or
(Ca,Sr).sub.2Si.sub.5N.sub.8:EU.sup.2+, oxynitride such as
.alpha.-SiAlON:Eu.sup.2+, or sulfide such as (Ca,Sr)S:Eu.sup.2+.
The green phosphor material can be aluminate such as
(Y,Lu,Gd).sub.3(Al,Ga).sub.5O.sub.12:Ce.sup.3+, oxynitride such as
(Ba.sub.1-x-ySr.sub.xCa.sub.y)Si.sub.2O.sub.2N.sub.2:EU.sup.2+ or
.beta.-SiAlON:Eu.sup.2+, or sulfide such as
Sr(Al,Ga).sub.2S.sub.4:Eu.sup.2+. The yellow phosphor material can
be aluminate such as Y.sub.3Al.sub.5O.sub.12:Ce.sup.3+. In one
embodiment, the glass material and the phosphor material in the
fluorescent composite material have a weight ratio of 1:999 to
90:10. An overly low ratio of the glass material may result in an
insufficient strength of the fluorescent composite material.
Conversely, higher ratio of the glass material may cause an
insufficient light-emitting efficiency of the fluorescent composite
material.
[0022] The fluorescent composite material may collocate with an
excitation light source to generate a light-emitting device. For
example, the excitation light source can be light-emitting diode,
laser diode, organic light-emitting diode, cold cathode fluorescent
lamp, or external-electrode fluorescent lamp. In one embodiment,
the light-emitting device can be applied to illumination,
projection, automotive headlights, or displays. For instance, when
a blue LED serves as the excitation light source, the
phosphor-converted LED is designed to leak some of the blue light
beyond the fluorescent composite to generate the blue portion of
the spectrum, while fluorescent composite convert the remainder of
the blue light into one or more visible light-emitting of the
spectrum. In one embodiment, the phosphor material in the
fluorescent composite material includes green phosphor material and
red phosphor material. As such, the phosphor material is excited by
the blue light to emit a red light and a green light, which are
mixed with the blue light passing through the fluorescent composite
material to produce a white light. The color temperature of the
white light-emitting device can be adjusted by tuning the type and
ratio of the phosphor materials. In one embodiment, the color
temperature of the white light-emitting device is 2000K to
6000K.
[0023] Below, exemplary embodiments are described in detail with
reference to the accompanying drawings so as to be easily realized
by a person having ordinary knowledge in the art. The inventive
concept may be embodied in various forms without being limited
[0024] to the exemplary embodiments set forth herein. Descriptions
of well-known parts are omitted for clarity, and like reference
numerals refer to like elements throughout.
EXAMPLES
Preparation Example 1
[0025] Li.sub.2O, Na.sub.2O, K.sub.2O, ZnO, B.sub.2O.sub.3, Al
.sub.2O.sub.3, Bi.sub.2O.sub.3, and SiO.sub.2 were weighed
according to the wt % in Table 1 (such as the parts by weight in
Table 2), put into a platinum crucible, and heated to 800.degree.
C. to 1000.degree. C. to be melted. The melted mixture was
water-quenched to form a glass bulk. The glass bulk was initially
cracked and then ball-milled to obtain glass powder with D.sub.50
of about 10 .mu.m.
[0026] Each of the glass powders (Serial No. A to N) was evenly
mixed with phosphor material Lu.sub.3Al.sub.5O.sub.12:Ce.sup.3+ and
(Ca,Sr)AlSiN.sub.3:Eu.sup.2+, filled in a mold, and then molded by
oil hydraulic compression to form a circular sheet preform with a
diameter of 5 cm and a thickness of 1 cm. The preform was sintered
at 600.degree. C. to form a fluorescent composite material. In
Tables 1 and 2, the compatibility of the glass powder and the
phosphor material is represented as .largecircle. when it was
excellent, .DELTA. when it was lower, and x when it was poor. The
excellent compatibility means that the luminescent properties of
the phosphors were preserved after the formation of the composite
material of the phosphor materials and the glass powder. The poor
compatibility means that the luminescent properties of the phosphor
material were dramatically declined after formation of the
composite material. As shown in Tables 1 and 2, the glass powders
of Serial No. B, D, and H had excellent compatibility with the
phosphor powders.
TABLE-US-00001 TABLE 1 Composition A B C D E F G Li.sub.2O 5 wt %
-- -- -- -- -- -- Na.sub.2O -- -- 5 wt % 0.5 wt % 20 wt % 5 wt % 5
wt % K.sub.2O -- 5% -- -- -- -- -- ZnO 5 wt % 5% 5 wt % 5 wt % 5 wt
% 1 wt % 20 wt % B.sub.2O.sub.3 20 wt % 20% 10 wt % 24.5 wt % 10 wt
% 20 wt % 10 wt % Al.sub.2O.sub.3 -- -- 10 wt % -- -- -- --
Bi.sub.2O.sub.3 60 wt % 60% 60 wt % 60 wt % 55 wt % 70 wt % 55 wt %
SiO.sub.2 10 wt % 10% 10 wt % 10 wt % 10 wt % 4 wt % 10 wt %
Phosphor .DELTA. .largecircle. .DELTA. .largecircle. .DELTA.
.DELTA. .DELTA. compatibility Composition H I J K L M N Li.sub.2O
-- -- -- -- -- -- -- Na.sub.2O 10 wt % 5 wt % 5 wt % 20 wt % 1 wt %
9 wt % 3 wt % K.sub.2O -- -- -- -- -- -- -- ZnO 20 wt % 1 wt % 5 wt
% 20 wt % 1 wt % 10 wt % 2 wt % B.sub.2O.sub.3 3 wt % 60 wt % -- 30
wt % 3 wt % 10 wt % 5 wt % Al.sub.2O.sub.3 -- -- 20 wt % -- -- --
-- Bi.sub.2O.sub.3 60 wt % 30 wt % 55 wt % 25 wt % 90 wt % 70 wt %
60 wt % SiO.sub.2 7 wt % 4 wt % 5 wt % 5 wt % 5 wt % 1 wt % 30 wt %
Phosphor .largecircle. .DELTA. .DELTA. .DELTA. .DELTA. .DELTA. X
compatibility
TABLE-US-00002 TABLE 2 (On the basis of the weight of
Bi.sub.2O.sub.3) Composition A B C D E F G Li.sub.2O 8.3 -- -- --
-- -- -- Na.sub.2O -- -- 8.3 0.8 36.4 7.1 9.1 K.sub.2O -- 8.3 -- --
-- -- -- ZnO 8.3 8.3 8.3 8.3 9.1 1.4 36.4 B.sub.2O.sub.3 33.3 33.3
16.6 40.8 18.2 28.5 18.2 Al.sub.2O.sub.3 -- -- 16.6 -- -- -- --
Bi.sub.2O.sub.3 100 SiO.sub.2 16.6 16.6 16.6 16.6 18.2 5.7 18.2
Phosphor .DELTA. .largecircle. .DELTA. .largecircle. .DELTA.
.DELTA. .DELTA. compatibility Composition H I J K L M N Li.sub.2O
-- -- -- -- -- -- -- Na.sub.2O 16.7 16.6 9.1 80 1.1 12.6 5 K.sub.2O
-- -- -- -- -- -- -- ZnO 33.3 3.3 9.1 80 1.1 14.3 3.3
B.sub.2O.sub.3 5 200 -- 120 3.3 14.3 8.3 Al.sub.2O.sub.3 -- -- 36.4
-- -- -- -- Bi.sub.2O.sub.3 100 SiO.sub.2 11.7 13.3 9.1 20 5.5 1.4
50 Phosphor .largecircle. .DELTA. .DELTA. .DELTA. .DELTA. .DELTA. X
compatibility
Comparative Example 1
[0027] Na.sub.2O, K.sub.2O, ZnO, B.sub.2O.sub.3, Al.sub.2O.sub.3,
SiO.sub.2, BaO, CaO, and MgO were weighed according to the wt % in
Table 3, put into a platinum crucible, and heated to 800.degree. C.
to 1000.degree. C. to be melted. The melted mixture was
water-quenched to form a glass bulk. The glass bulk was initially
cracked and then ball-milled to obtain glass powder with D.sub.50
of about 10 .mu.m.
[0028] Each of the glass powders (Serial No. Oand P) was evenly
mixed with phosphor material Lu.sub.3Al.sub.5O.sub.12:Ce.sup.3+ and
(Ca,Sr)AlSiN.sub.3:Eu.sup.2+, filled in a mold, and then molded by
oil hydraulic compression to form a circular sheet preform with a
diameter of 5 cm and a thickness of 1 cm. The preform was sintered
at 600.degree. C. to form a fluorescent composite material. As
shown in Table 3, the glass powders of Serial No. O and P lack of
Bi.sub.2O.sub.3 and exhibited the poor compatibility with the
phosphor powders.
TABLE-US-00003 TABLE 3 Composition O P Li.sub.2O -- -- Na.sub.2O 7
wt % 5 wt % K.sub.2O 3 wt % 2 wt % ZnO -- 10 wt % B.sub.2O.sub.3 7
wt % 5 wt % Al.sub.2O.sub.3 8 wt % 10 wt % Bi.sub.2O.sub.3 -- --
SiO.sub.2 70 wt % 60 wt % BaO 3 wt % -- CaO 2 wt % 5 wt % MgO -- 3
wt % Phosphor X X compatibility
Example 1
[0029] 90 wt %, 80 wt %, and 70 wt % of the glass powder of Serial
No. B in Preparation Example 1 were mixed with 10 wt %, 20 wt %,
and 30 wt % of a yellow phosphor powder
Y.sub.3Al.sub.5O.sub.12:Ce.sup.3+ (YAG, YY563LL commercially
available from China Glaze Co., Ltd.). The mixture was preformed
and sintered to form a fluorescent composite material. The
fluorescent composite material was excited by a blue light with a
wavelength of 450 nm to generate a broad band emission with an
emission peak at 550 nm, as shown in FIG. 1. The emission spectrum
was measured by HORIBA Fluoromax-4. The emission intensity was
found to rise as the ratio of YAG increases.
[0030] The fluorescent composite material sheet was collocated with
a blue LED. The electroluminescent spectrum of the package was
measured by Labsphere integrating sphere was shown in FIG. 2. Some
part of the blue light passed through the fluorescent composite
material (see left portion of the electroluminescent spectrum), and
some part of the blue light excited YAG to emit a yellow light (see
right portion of the electroluminescent spectrum). The
electroluminescent spectrum of the package is the result of the
blue light and the yellow light.
Example 2
[0031] 90 wt % of the glass powder of Serial No. B in Preparation
Example 1 was mixed with 10 wt % of a green phosphor powder
Lu.sub.3Al.sub.5O.sub.12:Ce.sup.3+ (LuAG, LG535L commercially
available from China Glaze Co., Ltd.). The mixture was preformed
and sintered to form a fluorescent composite material. The
fluorescent composite material was excited by a blue light with a
wavelength of 450 nm to obtain a broad band emission with an
emission peak between 520 nm to 545 nm, as shown in FIG. 3. The
emission spectrum was measured by HORIBA Fluoromax-4.
[0032] The fluorescent composite material sheet was collocated with
a blue LED and packaged. The electroluminescent spectrum of the
package was measured by Labsphere integrating sphere, as shown in
FIG. 4. Some part of the blue light passed through the fluorescent
composite material (see left portion of the electroluminescent
spectrum), and some part of the blue light excited LuAG to emit a
green light (see right portion of the electroluminescent spectrum).
The electroluminescent spectrum of the package is the mixing result
of the blue light and the green light.
Example 3
[0033] 90 wt % of the glass powder of Serial No. B in Preparation
Example 1 was mixed with 10 wt % of a green phosphor powder
Y.sub.3(Al,Ga).sub.5O.sub.12:Ce.sup.3+ (GaYAG, GG535M commercially
available from China Glaze Co., Ltd.). The mixture was preformed
and sintered to form a fluorescent composite material. The
fluorescent composite material was excited by a blue light with a
wavelength of 450 nm to generate a broad band emission with an
emission peak between 520 nm to 545 nm, as shown in FIG. 5. The
emission spectrum was measured by HORIBA Fluoromax-4.
Example 4
[0034] 90 wt % of the glass powder of Serial No. B in Preparation
Example 1 was mixed with 10 wt % of a red phosphor powder
(Ca,Sr)AlSiN.sub.3:Eu.sup.2+ (BR102Q commercially available from
Mitsubishi Chemical Cooperation). The mixture was preformed and
sintered to form a fluorescent composite material. The fluorescent
composite material was excited by a blue light with a wavelength of
450 nm to obtain a broad band emission with an emission peak
between 615 nm to 670 nm, as shown in FIG. 6. The emission spectrum
was measured by HORIBA Fluoromax-4.
[0035] The fluorescent composite material sheet was collocated with
a blue LED and packaged. The electroluminescent spectrum of the
package was measured by Labsphere integrating sphere, as shown in
FIG. 7. Some part of the blue light passed through the fluorescent
composite material (see left portion of the electroluminescent
spectrum), and some part of the blue light excited
(Ca,Sr)AlSiN.sub.3:Eu.sup.2+ to emit a red light (see right portion
of the electroluminescent spectrum). The electroluminescent
spectrum of the package is the mixing result of the blue light and
the red light.
Example 5
[0036] 90 wt % of the glass powder of Serial No. B in Preparation
Example 1 was mixed with 10 wt % of a red phosphor powder
(Ca,Sr).sub.2Si.sub.5N.sub.8:Eu.sup.2+ (NR625A2 commercially
available from China Glaze Co., Ltd.). The mixture was preformed
and sintered to form a fluorescent composite material. The
fluorescent composite material was excited by a blue light with a
wavelength of 450 nm to obtain a broad band emission with an
emission peak between 615 nm to 670 nm, as shown in FIG. 8. The
emission spectrum was measured by HORIBA Fluoromax-4.
Example 6
[0037] 85 wt % of the glass powder of Serial No. B in Preparation
Example 1 was mixed with 15 wt % of phosphor powders. The mixture
was preformed and sintered to form a fluorescent composite
material. The phosphor powders included a green phosphor powder
Lu.sub.3Al.sub.5O.sub.12:Ce.sup.3+ and a red phosphor powder
(Ca,Sr)AlSiN.sub.3:Eu.sup.2+, in which the green phosphor powder
and the red phosphor powder had a weight ratio of 95:5.
[0038] The white LED was fabricated by combining a blue LED and the
fluorescent composite material sheet. The electroluminescent
spectrum of the package was measured by Labsphere integrating
sphere, as shown in FIG. 9. Some part of the blue light passed
through the fluorescent composite material (see left portion of the
electroluminescent spectrum), and some part of the blue light
excited Lu.sub.3Al.sub.5O.sub.12:Ce.sup.3+ and
(Ca,Sr)AlSiN.sub.3:Eu.sup.2+ to emit a green light and a red light
(see right portion of the electroluminescent spectrum). The
electroluminescent spectrum of the package is the mixing result of
the blue light, the green light, and the red light. The color
temperature of the white LED was found to be 3000K.
Example 7
[0039] 85 wt % of the glass powder of Serial No. B in Preparation
Example 1 was mixed with 15 wt % of phosphor powders. The mixture
was preformed and sintered to form a fluorescent composite
material. The phosphor powders included a green phosphor powder
Lu.sub.3Al.sub.5O.sub.12:Ce.sup.3+ and a red phosphor powder
(Ca,Sr)AlSiN.sub.3:Eu.sup.2+, in which the green phosphor powder
and the red phosphor powder had a weight ratio of 90:10.
[0040] The white LED was fabricated by combining a blue LED and the
fluorescent composite material sheet. The electroluminescent
spectrum of the package was measured by Labsphere integrating
sphere, as shown in FIG. 10. Some part of the blue light passed
through the fluorescent composite material (see left portion of the
electroluminescent spectrum), and some part of the blue light
excited Lu.sub.3Al.sub.5O.sub.12:Ce.sup.3+ and
(Ca,Sr)AlSiN.sub.3:Eu.sup.2+ to emit a green light and a red light
(see right portion of the electroluminescent spectrum). The
electroluminescent spectrum of the package is the result of the
blue light, the green light, and the red light. The color
temperature of the white LED was found to be 2000K.
Example 8
[0041] 85 wt % of the glass powder of Serial No. B in Preparation
Example 1 was mixed with 15 wt % of phosphor powders. The mixture
was preformed and sintered to form a fluorescent composite
material. The phosphor powders included a green phosphor powder
Y.sub.3(Al,Ga).sub.5O.sub.12:Ce.sup.3+ and a red phosphor powder
(Ca,Sr)AlSiN.sub.3:Eu.sup.2+, in which the green phosphor powder
and the red phosphor powder had a weight ratio of 85:15.
[0042] The white LED was composed of a blue LED and the fluorescent
composite material sheet. The electroluminescent spectrum of the
package was measured by Labsphere integrating sphere, as shown in
FIG. 11. Some part of the blue light passed through the fluorescent
composite material (see left portion of the electroluminescent
spectrum), and some part of the blue light excited
Y.sub.3(Al,Ga).sub.5O.sub.12:Ce.sup.3+ and
(Ca,Sr)AlSiN.sub.3:Eu.sup.2+ to emit a green light and a red light
(see right portion of the electroluminescent spectrum). The
electroluminescent spectrum of the package is the result of the
blue light, the green light, and the red light. The color
temperature of the white LED was found to be 2700K.
Example 9
[0043] 90 wt % of the glass powder of Serial No. B in Preparation
Example 1 was mixed with 10 wt % of phosphor powders. The mixture
was preformed and sintered to form a fluorescent composite
material. The phosphor powders included a green phosphor powder
Y.sub.3(Al,Ga).sub.5O.sub.12:Ce.sup.3+ and a red phosphor powder
(Ca,Sr)AlSiN.sub.3:Eu.sup.2+, in which the green phosphor powder
and the red phosphor powder had a weight ratio of 90:10.
[0044] The white LED was fabricated by combining a blue LED and the
fluorescent composite material sheet. The electroluminescent
spectrum of the package was measured by Labsphere integrating
sphere, as shown in FIG. 12. Some part of the blue light passed
through the fluorescent composite material (see left portion of the
electroluminescent spectrum), and some part of the blue light
excited Y.sub.3(Al,Ga).sub.5O.sub.12:Ce.sup.3+ and
(Ca,Sr)AlSiN.sub.3:Eu.sup.2+ to emit a green light and a red light
(see right portion of the electroluminescent spectrum). The
electroluminescent spectrum of the package is the result of the
blue light, the green light, and the red light. The color
temperature of the white LED was determined to be 5000K.
Example 10
[0045] 80 wt % of the glass powder of Serial No. B in Preparation
Example 1 was mixed with 20 wt % of phosphor powders. The mixture
was preformed and sintered to form a fluorescent composite
material. The phosphor powders included a green phosphor powder
Y.sub.3(Al,Ga).sub.5O.sub.12:Ce.sup.3+ and a red phosphor powder
(Ca,Sr)AlSiN.sub.3:Eu.sup.2+, in which the green phosphor powder
and the red phosphor powder had a weight ratio of 90:10.
[0046] The white LED was composed of a blue LED and the fluorescent
composite material sheet. The electroluminescent spectrum of the
package was measured by Labsphere integrating sphere, as shown in
FIG. 12. The blue LED emits a blue light, some part of the blue
light passed through the fluorescent composite material (see left
portion of the electroluminescent spectrum), and some part of the
blue light excited Y.sub.3(Al,Ga).sub.5O.sub.12:Ce.sup.3+ and
(Ca,Sr)AlSiN.sub.3:Eu.sup.2+ to emit a green light and a red light
(see right portion of the electroluminescent spectrum). The
electroluminescent spectrum of the package is the result of the
blue light, the green light, and the red light. The color
temperature of the white LED was determined to be 3000K.
[0047] It will be apparent to those skilled in the art that various
modifications and variations can be made to the disclosed methods
and materials. It is intended that the specification and examples
be considered as exemplary only, with a true scope of the
disclosure being indicated by the following claims and their
equivalents.
* * * * *